Wigan will begin their defence of the Carnegie Challenge Cup against the newly formed Wrexham club North Wales Crusaders next month. The Warriors will have home advantage against the Championship One club, whose coach, Clive Griffiths, was previously in charge of Wales, on the weekend of 13-15 April.

Last year's runners-up Leeds, the reigning Super League champions, will be at home to Wakefield in one of four all-Super League ties. The other top-flight clashes see St Helens, who gained a hat-trick of cup final victories from 2006 to 2008, take on former cup kings Widnes at the Stobart Stadium, Hull KR host Catalan Dragons and Huddersfield go to Hull FC.

Wigan's head coach, Shaun Wane, who was assistant to Michael Maguire when the Warriors lifted the trophy at Wembley last August, was pleased to see his side paired with third-tier opposition. "I'm quite happy with that," he said. "We'll give them the respect they deserve but it could have been a lot worse."

Crusaders, formed from the ashes of the old Super League club at the Racecourse Ground, knocked out the leading French club Toulouse in the third round in Wrexham on Saturday.

The St Helens captain, Paul Wellens, admits his side will feel at home at Widnes, with whom they shared the Stobart Stadium until moving to Langtree Park this year. "We would have liked a home draw but this is the next best thing for us, seeing as we spent the whole of last season there," he said.

There will be another derby at Featherstone, who host their top-flight neighbours Castleford. Six all-Championship ties will guarantee plenty of non-Super League representation in the last 16.Meanwhile, Warrington's England forward Ben Westwood looks set to miss Friday's Super League derby with St Helens after being charged over an incident that broke the nose of his team-mate Trent Waterhouse. Westwood reacted angrily to a raised elbow by Wigan's prop Epalahame Lauaki during his side's 22-20 win over the Warriors last Friday and was put on report by the referee, Richard Silverwood. Westwood's swinging arm accidentally crashed into Waterhouse's face before also connecting with Lauaki and he has been charged with a grade B offence ofstriking an opponent. That offence carries a ban of between one and two matches.